1. Epidemiological Monitoring Center on Addiction, Mental Health DSM-DP, Ausl Bologna, Bologna, Italy
2. Department of Medical and Surgical Sciences G. Fontana, Centre for the Study and Multidisciplinary Treatment of Alcohol Addiction, University of Bologna, Bologna, Italy
3. Epidemiological Monitoring Center on Addiction, Mental Health DSM-DP, Azienda USL Bologna, Bologna, Italy
4. Department of Internal Medicine, SS Annunziata Hospital, Cento (Ferrara), Italy
5. Department of statistics, Città Metropolitana of Bologna, Italy